figure 26.17 
-Based on figure 26.17,you conclude:
A) c-opsin arose independently in vertebrates
B) r-opsin arose independently in invertebrates
C) an organism can only have one type of opsin
D) c-opsin and r-opsin arose from a common ancestral protein
E) c-opsins are in photoreceptor cells in vertebrates and invertebrates
Correct Answer:
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